JPS5866041A - Dryness detecting and displaying circuit - Google Patents

Abstract

PURPOSE:To display the completion of drying operation by comparing a dryness detector voltage with a predetermined voltage, switcing on or off a first transistor, switching off the power source of a dryer upon completion of drying operation and impressing a voltage on a dryness indicator. CONSTITUTION:A grain dryness detector display voltage V1, through a diode 30 and a resistor 34, is inputted into a comparator 38 as voltage V2 and is compared with a set voltage V3 corresponding to a predetermined dryness, and then is displayed on a dryness indicator 35. When V2 becomes higher than V3, a comparative voltage V4 becomes zero and a voltage V5 becomes low due to a voltage drop of a diode 39, then a transistor 43 and a relay 42 are switched off so as to cause the dryer to stop working. At this time, a transistor 32 is switched on to impress the power source voltage on V2 through a diode 31 and a resistor 33 thereby the grain dryer accurately stops working while the dryness indicator 35 keeps on displaying as the voltage is still impressed on it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grain dryness detection and display circuit.

Grain, such as paddy, is dried and buried using an automatic drying device. FIG. 1 shows an example of an automatic drying apparatus, and this figure will be explained below. 1 is a hopper which is shaped like a funnel.

There is a discharge port 2 at the lower end of the hopper 1, and the paddy discharged from the discharge port 2 is transported to the upper end opening $6 of the hopper 1 by a transport means 5 consisting of a screw conveyor 3 and a packet conveyor 4. . A horizontal ventilation passage 7 is provided in the hopper 1, and this ventilation passage 7 communicates with a hot air chamber 8 provided below the hopper 1. Hot air is sent into the hot air chamber 8 by an air blowing means 22 composed of an air blower 9 and a heat exchanger 10. The paddy 11 in the hopper 1 is moved out of the discharge port 2 little by little.
1-12. That is, the shutter 12 is rotated about a shaft 15 by an electric motor (not shown),
It is opened and closed. The amount of paddy put into hopper 1 is 20~
50 minutes once, and this operation is generally done for 10#I.
The drying process continues for a period of f.

Although there are various types of dryness measuring device 17 for measuring the degree of dryness of paddy that is being circulated in the automatic drying Mm, one that uses microwaves is generally used. As shown in FIG. 1, this is composed of a transmitter 14, a receiver 15, and a waveguide t16 connecting the two. In other words, the waveguide 16
When the paddy 11 is brought close to the paddy 11, if the paddy 11 is well dried, less microwaves will leak from the waveguide 16, but if the paddy 11 is not sufficiently dried, more microwaves will leak from the waveguide 16. . Therefore, by checking the difference between the strength of the microwaves emitted from the transmitter 14 and the strength of the microwaves received by the receiver 15, the degree of dryness of the rice grains 11 can be measured.

As a result of this dryness measurement, if a predetermined dryness is detected,
The automatic drying lid stops shaking, but conventional equipment does not stop this.
The dryness display of the paddy returned to zero, and it was not possible to know the dryness at the end of drying, and the device stopped at the specified dryness, or there was a malfunction in the circuit, and the dryness was still not at the specified dryness. There is a problem in that it is not possible to determine whether the device has stopped even though it has reached a certain level.

In view of the above-mentioned problems in the prior art, the present invention provides a grain dryness detection and display device that automatically displays a message when the dryness of the grain is at a predetermined value when the drying device is stopped. It is to be.

However, a feature of the present invention is that when the degree of dryness reaches a set value, the drying device is powered off and a voltage is applied to the degree of dryness indicator to maintain the degree of dryness indicated by the degree of dryness indicator. .

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit diagram for explaining the dryness detection and display device according to the present invention, and FIG. 2 is a diagram for explaining changes in each voltage value in FIG. 1.

In Figures 1 and 2, the grain dryness detection voltage
, are inputted to a comparator 38 as a voltage V through a diode 30 and a resistor 34, and are compared with a set voltage V corresponding to a predetermined degree of dryness. is displayed. The comparator 38 compares the voltage dropped by the diode 30 and the resistor 34 with the detected voltage V, 7, and the set voltage V, and calculates the comparison result as a ratio 4! It is determined as forming pressure v4. Setting voltage L'lt
'If the detection voltage V is made higher, the comparison voltage v4 becomes a high voltage. Therefore, the voltage V between the diode 39 and the resistor 41
, is the value obtained by dividing the voltage power supply (+12V) by the resistors 40 and 41, regardless of the comparison voltage V, and since the voltage V is applied to the pace of the transistor 43 via the resistor 41, the transistor 4 is turned on. do. This transistor 43
When turned on, the relay 42 for turning on and off the power of the drying device is turned on, and the drying device continues drying.

Also, at this time, a transistor is connected from the collector of the transistor 43 through the resistor 35! Since the voltage V applied to the pace No. 12 is a low voltage, the transistor 32 remains off, and the dryness indicator 35 displays only the dryness detection voltage ■.

Now, when the detection voltage ■ becomes higher than the set voltage V (when the degree of dryness exceeds the set degree of dryness), the comparison voltage ■4 becomes zero, and the voltage ■ becomes the voltage drop of the diode 39. For example, it is set to o, 5V. Therefore, when the transistor 43 is turned off, the relay 42 is also turned off and the drying device is stopped.The detected voltage V gradually increases as shown in FIG. The voltage applied to the pace is approximately 12V.
Therefore, the transistor 52 is turned on, and the power supply voltage is no longer applied to the detection voltage V through the diode 31 and the resistor 33. Therefore, the apparent detection voltage V is always larger than the set voltage (2), which prevents the transistor 45 from turning on and driving the dry m device. What is the indication of leprosy by the Manen Dryness Indicator 35? ! As shown in Fig. 44, even when the device is stopped, it does not return to zero, and it can be confirmed that the device has stopped due to sufficient drying. That is, with drying, the pointer 45 becomes 1% less than 25%.
After moving to the 0% direction and discharging the set moisture, "drying is completed" by applying the power supply voltage to the dryness indicator 35 (at the same time as stopping the drying by turning off the relay 42).
Display.

Note that as time passes, the temperature detection voltage V.

As a result, the pointer 45 changes to tsi,! It goes without saying that the moisture percentage will return to the level corresponding to the pressure.

As described above, according to the present invention, when the dryness detection voltage passes up to the set dryness voltage, the drying device is stopped, and the voltmeter (dryness display meter) that receives the dryness detection voltage as input is connected to the dryness detection voltage. Since the dryness level displayed by the voltmeter can be maintained by inputting the data to the temperature voltage comparator, it is possible to clearly indicate that the apparatus has stopped after a predetermined level of drying has been performed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an automatic drying device, and FIG. 2 is a diagram showing a dryness detection and display circuit according to an embodiment of the present invention. FIG. 3 is a diagram illustrating each voltage change of the circuit shown in FIG. 2, and FIG. 4 is a diagram showing a dryness display section according to the present invention. 30.31.39...Diode, 52 and 43...
・Transistor, 33, 34, 37. jlO,41...
・Resistance, 35... Dryness indicator, 38... Comparator,
42...'Power supply relay of drying equipment, 36...Port J variable resistor. Agent Patent Attorney Susuki 1) Li died due to punishment.

Claims (1)

[Claims] By comparing the dryness detection voltage, which is the output of the dryness measuring device, with the voltage set corresponding to a predetermined dryness, the dryness detection and display circuit detects and indicates the completion of drying, and the detected voltage is a comparison detection means that turns on the first transistor when the detected voltage is lower than the set voltage, and turns off the first transistor when the detected voltage is lower than the set voltage; Drying bag Tj connected to power supply
IL power relay and 11! A dryness detection and display circuit comprising: a second transistor having a base and a collector connected to the source and having an emitter connected to the dryness detection voltage.